Smells like this falls under the third-party work.
Assigning to chrisha for initial triage.

Pat's been chasing this down.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ec62dede44126cc0c5086fdaf9a7ff3af804923f

commit ec62dede44126cc0c5086fdaf9a7ff3af804923f
Author: Patrick Monette <pmonette@chromium.org>
Date: Fri Jun 01 18:03:58 2018

Fix duplicate entries in InstalledApplications for 32-bit OSes

Duplicate entries would mess with the association of modules to their
application.

The current logic discards a conflict when it has multiple application
matches. This is because we can't know for sure which of the
applications really owns the module.

Bug:  845274 
Change-Id: I1649e80ea9fc6a149351003fd4a1db56d966f770
Reviewed-on: https://chromium-review.googlesource.com/1081565
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563718}
[modify] https://crrev.com/ec62dede44126cc0c5086fdaf9a7ff3af804923f/chrome/browser/conflicts/installed_applications_win.cc
[modify] https://crrev.com/ec62dede44126cc0c5086fdaf9a7ff3af804923f/chrome/browser/conflicts/installed_applications_win.h
[modify] https://crrev.com/ec62dede44126cc0c5086fdaf9a7ff3af804923f/chrome/browser/conflicts/installed_applications_win_unittest.cc

Requesting merge to m67

This fixes the Incompatible Applications feature for users on 32-bit Windows.

Requesting this late because we have an external commitment to launching the feature (https://blog.chromium.org/2017/11/reducing-chrome-crashes-caused-by-third.html). We've already delayed it for one milestone, and we don't want it delayed further.

This is a very safe merge given the size of the CL and the fact that the code runs behind a finch flag.

This bug requires manual review: Request affecting a post-stable build
Please contact the milestone owner if you have questions.
Owners: cmasso@(Android), cmasso@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

this should be merged to m68 before m67...?

Approving merge to M67 branch 3396 based on comment #5 and per offline chat with pmonette@. Please merge ASAP. Thank you.

This will also need a merge to M68. Pls request a merge to M68.

Re #7: Do we want to have this change baked in M68 beta which is schedule for release on June 7th before merging to M67?

Note: We're cutting M67 stable respin RC today for release this week tomorrow/Wed.

approved for 68. branch:3440

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a63f29aafd7bd0ec7dd5256f9426f390d0717d98

commit a63f29aafd7bd0ec7dd5256f9426f390d0717d98
Author: Patrick Monette <pmonette@chromium.org>
Date: Mon Jun 04 21:38:33 2018

Fix duplicate entries in InstalledApplications for 32-bit OSes

Duplicate entries would mess with the association of modules to their
application.

The current logic discards a conflict when it has multiple application
matches. This is because we can't know for sure which of the
applications really owns the module.

Bug:  845274 
Change-Id: I1649e80ea9fc6a149351003fd4a1db56d966f770
Reviewed-on: https://chromium-review.googlesource.com/1081565
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#563718}(cherry picked from commit ec62dede44126cc0c5086fdaf9a7ff3af804923f)
Reviewed-on: https://chromium-review.googlesource.com/1085933
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/branch-heads/3440@{#173}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
[modify] https://crrev.com/a63f29aafd7bd0ec7dd5256f9426f390d0717d98/chrome/browser/conflicts/installed_applications_win.cc
[modify] https://crrev.com/a63f29aafd7bd0ec7dd5256f9426f390d0717d98/chrome/browser/conflicts/installed_applications_win.h
[modify] https://crrev.com/a63f29aafd7bd0ec7dd5256f9426f390d0717d98/chrome/browser/conflicts/installed_applications_win_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/455de4fd5a672ad592b2092d013afb33a2b81e3a

commit 455de4fd5a672ad592b2092d013afb33a2b81e3a
Author: Patrick Monette <pmonette@chromium.org>
Date: Mon Jun 04 22:40:21 2018

Fix duplicate entries in InstalledApplications for 32-bit OSes

Duplicate entries would mess with the association of modules to their
application.

The current logic discards a conflict when it has multiple application
matches. This is because we can't know for sure which of the
applications really owns the module.

Bug:  845274 
Change-Id: I3fc70d3782a56721ae7e0754230fdb761401000e
Reviewed-on: https://chromium-review.googlesource.com/1086235
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/branch-heads/3396@{#743}
Cr-Branched-From: 9ef2aa869bc7bc0c089e255d698cca6e47d6b038-refs/heads/master@{#550428}
[modify] https://crrev.com/455de4fd5a672ad592b2092d013afb33a2b81e3a/chrome/browser/conflicts/installed_programs_win.cc
[modify] https://crrev.com/455de4fd5a672ad592b2092d013afb33a2b81e3a/chrome/browser/conflicts/installed_programs_win.h
[modify] https://crrev.com/455de4fd5a672ad592b2092d013afb33a2b81e3a/chrome/browser/conflicts/installed_programs_win_unittest.cc